# Copyright 2020-2025 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
import time

import pytest

from trl.experimental.judges import AllTrueJudge, HfPairwiseJudge, PairRMJudge

from ..testing_utils import RandomBinaryJudge, TrlTestCase, require_llm_blender


class TestJudges(TrlTestCase):
    def _get_prompts_and_pairwise_completions(self):
        prompts = ["The capital of France is", "The biggest planet in the solar system is"]
        completions = [["Paris", "Marseille"], ["Saturn", "Jupiter"]]
        return prompts, completions

    def _get_prompts_and_single_completions(self):
        prompts = ["What's the capital of France?", "What's the color of the sky?"]
        completions = ["Marseille", "blue"]
        return prompts, completions

    def test_all_true_judge(self):
        judge = AllTrueJudge(judges=[RandomBinaryJudge(), RandomBinaryJudge()])
        prompts, completions = self._get_prompts_and_single_completions()
        judgements = judge.judge(prompts=prompts, completions=completions)
        assert len(judgements) == 2
        assert all(judgement in {0, 1, -1} for judgement in judgements)

    @pytest.mark.skip(reason="This test needs to be run manually since it requires a valid Hugging Face API key.")
    def test_hugging_face_judge(self):
        judge = HfPairwiseJudge()
        prompts, completions = self._get_prompts_and_pairwise_completions()
        ranks = judge.judge(prompts=prompts, completions=completions)
        assert len(ranks) == 2
        assert all(isinstance(rank, int) for rank in ranks)
        assert ranks == [0, 1]

    def load_pair_rm_judge(self):
        # When using concurrent tests, PairRM may fail to load the model while another job is still downloading.
        # This is a workaround to retry loading the model a few times.
        for _ in range(5):
            try:
                return PairRMJudge()
            except ValueError:
                time.sleep(5)
        raise ValueError("Failed to load PairRMJudge")

    @require_llm_blender
    @pytest.mark.skipif(
        sys.version_info[:3] == (3, 13, 8), reason="Python 3.13.8 has a bug in inspect.BlockFinder (cpython GH-139783)"
    )
    def test_pair_rm_judge(self):
        judge = self.load_pair_rm_judge()
        prompts, completions = self._get_prompts_and_pairwise_completions()
        ranks = judge.judge(prompts=prompts, completions=completions)
        assert len(ranks) == 2
        assert all(isinstance(rank, int) for rank in ranks)
        assert ranks == [0, 1]

    @require_llm_blender
    @pytest.mark.skipif(
        sys.version_info[:3] == (3, 13, 8), reason="Python 3.13.8 has a bug in inspect.BlockFinder (cpython GH-139783)"
    )
    def test_pair_rm_judge_return_scores(self):
        judge = self.load_pair_rm_judge()
        prompts, completions = self._get_prompts_and_pairwise_completions()
        probs = judge.judge(prompts=prompts, completions=completions, return_scores=True)
        assert len(probs) == 2
        assert all(isinstance(prob, float) for prob in probs)
        assert all(0 <= prob <= 1 for prob in probs)
